Look for "No 10 awg, Tinned Marine Grade Cable"
https://www.amazon.com/Ancor-Marine-Grade-Duplex-Cables/dp/B000NUYBRK/ref=sr_1_6?ie=UTF8&qid=1494550554&sr=8-6&keywords=marine%2Btinned%2Bcable&th=1This post may help if you want to clean house.
Independent Brake Wire Feed UpgradeIf you go the 2 wire cable route, you can skip the junction box in the back and run a separate 2 wire cable from the A frame header down each side of the camper. The front of both are joined to the truck 7 wire cable, then run one down each side of the camper to the axles. You are bringing a ground and hot brake wire to the back. For the front axle, just skin the insulation and solder on a pig tail to the front axle brake coil, 3M 33 tape and shrink wrap the pigtail joining section. Then keep the main trunk cable going to the rear axle brake coil. This does not break the cable at the first axle.
This gives to a sound ground and hot wire on each side of the camper and there is no wire in the axle tube or strapped to the back of it. This also helps each brake coil get a direct hot wire and ground and not dependent on any other coils joined like the original setup was.
We just did my sons camper this way. He was able to drop 2 numbers on the gain after we fixed it all up. Well worth the time to upgrade.
Hope this helps
John
